Pt Magnetic Polarization onY3Fe5O12and Magnetotransport Characteristics

Abstract

Thin Pt films on an yttrium iron garnet (YIG = Y(3)Fe(5)O(12)) show ferromagneticlike transport properties, which may impact the functionality of Pt in spin current detection, but do not provide direct quantitative information on the Pt magnetization. We report magnetic x-ray magnetic circular dichroism measurements of YIG/Pt(1.5 nm) showing an average Pt moment of 0.054 μ(B) at 300 K and 0.076 μ(B) at 20 K. This observation indicates strong proximity effects and induced magnetic ordering in Pt on magnetic insulators and their contribution to the spin-related measurements should not be neglected. The transport characteristics also suggest considerable modifications in the Pt electronic structure due to magnetic ordering.

Fieldlike spin-orbit torque in ultrathin polycrystalline FeMn films

“…Structural and magnetic properties of FeMn sample is slightly higher than that of the Au capped sample, and both are almost double of that of the Ta capped sample. This is consistent with earlier reports that (1) Pt interfacial layer can be easily magnetized through proximity effect when contacting with a FM 37,38 , but the same type of effect is weak in Au 39 and (2) Ta can create magnetic dead layer in the adjacent FM 40 . Similar proximity effect has been observed at FeMn/Pt interfaces in previous studies on exchange bias 41,42 .…”

Measurement of the intrinsic damping constant in individual nanodisks of Y3Fe5O12 and Y3Fe5O12|Pt

“…The influence of an adjacent Pt layer is shown to increase the damping threefold. We attribute this increase exclusively 16,[20][21][22] to spinpumping effect. 17 The characteristic parameter for the efficiency of spin transfer across the interface and the accompanying increase of damping in YIG is the spin mixing conductance G "# .…”

Length Scale of the Spin Seebeck Effect

“…Despite this explanation of the origin of the effect, direct experimental evidence has not been reported. While parasitic interface effects [11] were suggested as an alternative source of the SSE due to a polarization of the paramagnetic detector layer [12], generally, the observed effects are now primarily attributed to magnonic spin currents [13,14].…”

“…Despite this explanation of the origin of the effect, direct experimental evidence has not been reported. While parasitic interface effects [11] were suggested as an alternative source of the SSE due to a polarization of the paramagnetic detector layer [12], generally, the observed effects are now primarily attributed to magnonic spin currents [13,14].Time resolved experiments trying to address the problem by probing the temporal evolution of the SSE have obtained contradictory results: For film thickness up to 61 nm, no cut-off frequency due to an intrinsic limitation by the SSE was observed [15]. In contrast, for μm thick films, a characteristic rise time was found, and a finite magnon propagation length of the order of several 100 nm was put forward as a possible explanation [16,17].…”